וַיַּ֥עַל מִשָּׁ֖ם בְּאֵ֥ר שָֽׁבַע׃
以撒從那裡上到別是巴。
Rabbeinu Bahya
ויצא יעקב מבאר שבע, “Yaakov left Beer Sheva, etc.” Beer Sheva is part of the land of Israel as we have been told in 26,23 that Yitzchak moved from the land of the Philistines to Beer Sheva. Seeing that that we know that Yitzchak never left the land of Israel, it is clear that Beer Sheva was part of this land. We had also read that Yitzchak had named the town (26,33).